Check the listing for details. Shure SM7dB Active Dynamic Microphone. Color: Black, Condition: New. Listed at 494.00 USD. The Prized SM7B Gets a Major Upgrade The Shure SM7B is a legendary vocal microphone used and held in regard by musicians, podcasters, broadcasters, and streamers worldwide. That said, the SM7B possesses a notoriously low output, requiring users to utilize an in-line booster to get a usable level out of the mic. The Shure SM7dB is here to offer you a more elegant solution. This dynamic microphone serves up the tried-and-true SM7B sound; however, thanks to its built-in active preamp, you get output levels suitable for any recording setup or application — no separate booster required. You can bypass the built-in preamp if you want to replicate the original SM7B's performance, and the SM7dB includes its predecessor's oft-used bass roll-off and presence boost controls.